
const name = 'Lydia Hallie';
const age = 21;
console.log(Number.isNaN(name));
console.log(Number.isNaN(age));
console.log(isNaN(name));
console.log(isNaN(age));
var a=[,,,].join(',')
console.log((a))


var ary = Array(3);
ary[0]=2
a=ary.map(function(elem) { return '1'; });
console.log(a)

var a = 111111111111111110000,
    b = 1111;
console.log(a + b);


(function(){
    var x = y = 1;
})();
console.log(y);
// console.log(x);





